Updated: Dec 15, 2020
Space is everything! No, really, it is! Space, or outer space, is everything you can and cannot see. Planets, stars, comets, asteroids, satellites, black holes, and countless other cosmic objects make up space. But wait. Let's not get ahead of ourselves. Let's start from the beginning.
At the beginning there is you. Maybe you're dreaming of one day becoming an astronaut. Or a scientist who knows all the answers (and then some). Or maybe you're just curious to learn what's the deal with the Universe. We get it. We have the curiosity bug ourselves, so let's have a look...up!
What is Space?
Space is the vast zone that surrounds our planet and contains every imaginable object that exists. The weirdest thing about space is that it has no air. And no sound either. In fact, space is a vacuum.
But space is not empty. Oh, no. Not at all. While it's true that the biggest part of space only contains dust and gas, the other part is filled with wonders.
Take Earth, for example. Earth is part of space. Earth is also part of the Solar System which, you guessed, is part of space. The Solar System is part of the Milky Way Galaxy, which, what do you know, is also part of space!
You see where we're going with this? Space contains every planet, star, comet, asteroid, satellite, black hole, and galaxy you've ever heard of. And even those you haven't heard of!
Oh, and don’t get us started on the mysterious dark matter. Yeap. It too is part of space.
Watch out for radiation!
If you ever make it to space (and we trust you will someday), you'd better be careful!
Besides dust and gas, space is also filled with radiation. And radiation is dangerous! Infrared and ultraviolet radiation from the Sun, plus X-rays, gamma rays, and cosmic rays from far, far away are all travelling through space.
To stay safe, you'll need to put on a costume or take cover in your spaceship. The radiation of the Sun can make your skin burn right here, on Earth, after too much time at the beach. Now imagine how that would feel in space, so much closer to the Sun!
Where does space begin and where does it end?
Stare out your window and look at the sky. If you had super-super-vision, maybe, just maybe you could see 100 kilometres up. Or, you know, if you had a telescope, then you could peek at the "entrance" in space. You see, 100 km above Earth is where the shell of our planet ends and space begins.
As for where space ends...everybody believes it doesn't. The truth is, we don't know. Not yet, anyway. But scientists have good reason to think that space goes on forever.
And it makes sense. Space is tremendously big. Bigger than big. Bigger than the biggest. After all, it does contain absolutely everything: the Sun, the Moon, our Planet, you, me, us.
Let's start a cool space exploration!
There you go, we’ve answered the big “What is space?” question.
Space can be cool and crazy. Together, we'll venture and explore all of it (or, you know, almost, since space is infinite)! We'll discover planets, stars, satellites, and even comets.
So your exploration begins. Keep an eye on our blog and buckle up, 'cause gravity is going to sweep you off your feet.